Improvement in stop-motion gear-wheels



lllIliIllllllllllllllllll-llllllllllll ".llllllllll *lllllllll that@ :entre JOHN H. WHITNEY, OF ROCHESTER., MINNESOTA.

Letters Patent No. 109,164, dated November 8, 1870.

IMPROVEMENT lN STOP-MOTION GEAR-WHEELS.

The Schedule referred to inV these' Letters Patent and making part of the same.

1'0 all twhom 'it may concern;

Be it known thatI, J oHN HAWHITNEY, of Rochester, in 'the county ot` Olmstead and State of Minnesota, have invented certain Improvements in 4Stop-NIO- tion Gear-Wheels, of which the following is a specilication, reference being had to the accompanying drawmg.

My invention relates to stop-gear. wheels, for producing an intermittent motion of one by a continuous rotary motion of the other; and

The invent-ion consists in the novel construction ot the wheels, as hereinafter more fully explained.

Figure lis a side elevation of two wheels constructed on my plan.

Figure 2 is an edge view of the saine.

' In many kinds ot' machinery it is necessary to in'ipart to certain motions auintermittent motion, and it is frequently desirable that the pinion or driven wheel should have a greater or lesser number of revolutions without changing the diameter ot' the wheels; and in all cases where this style of wheels is used it is specially desirable that the driven wheel or pinion should stop, and be held in an exact position, in order to permit the teeth ot' the driving-wheel to strike fair between the teeth of the -pnion when the motion of the latter is to be renewed, to prevent breaking or injuring of the gealy'andl'also to prevent the wheels from becoming locked by the striking together of the ends of the teeth. It is to acoomplish these objects, and to furnish a more perfect gearing, that my invention is intended.

To accomplish t-hese objects I construct my improved wheels as follows:

The'driving-wheel A I make .with teeth, on a portion of its periphery, more or less in extent, according to the size of the pinion to be driven and the number of revolutions it is to have. 4

Along the side' of the' wheel A, opposite that por-- tion of it which has no teeth, I make a laterally-projecting flange, c, as shown in gs.l..and 2, this ange being either cast solid with the wheel, or bolted to it, as preferred.

This flange e ceases at the point where the teeth begin, as shown iii igs. l and 2.

The pinion B I make in the usual form, but to one side of it I attach a stop'plate, c, as shown in lig. l.'

lThis plate or projection c has one end extended out beyond the periphery ot' the teeth, and its end face is cut or formed concave, in the form of asegment of a circle, corresponding with the circumfer-vv ence of the driving-wheel A, or rather of the flange' e thereon, as represented iiifig. 1.

r['his outer or concave edge-of the stop-platec'and the peripheryof the guard-flange @being 'turned or otherwise made smooth, so thatthe former maybear upon the latter, while the latter is in motion, without u 'in the usual manner, the teeth of the wheel A will engage with those of the wheel B, and cause the latter to revolve until all the teeth on A have passed the end ot' the stop-plate c, rotating with the wheel B, will project down alongside of the teeth on A, as rcpresented in fig. 2. At the instant, however, that the teeth have all passed, the flange c will have arrived at a position where the end ot' the stop-plate c will strike upon it as the plate comes opposite, and will thus hold 'the pinion B stationary while the wheel A continues its movement.

As the teeth onwheel A come around and again engage `with those ot' wheel B, the flange c will pass from under the stop-plate c, thus unlocking the pinion vand permitting it to resume its motion.

'Ihe end of plate c, where it bears o the flange e, may be enlarged or made wider than represented in the drawing, so as to have a broader bearing thereon, if desired. v

By this construction` I-anr able to produce a very superior stop-motion gear,'that will work witlgi-eat accuracyand smoothness, and which obviates, to a great extent, the danger ot breaking the teeth, or ot locking them so as to stop the machinery.

It is obvious that the wheels may be made of any proportions desired, and that the teeth may be ar plate e, all constructed and arranged to operate suhst-antially as described.

2. lhe wheel A, having its teeth and its fiange e each formed in sections, so that the sections may be Y attached or detached at will, and thus vary the number of lrevolutions ot' wheel B, as described.

JOHN H. WHITNEY.

Witnesses: W. 0. DODGE, PHIL; T. Denen. 

